Bifunctional electrode for alkaline water electrolysis, and preparation method and application thereof

A water electrolysis and electrode technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of alloy composition change, catalyst catalytic activity attenuation, etc., and achieve the effect of fast reaction speed, improved stability, and high electrocatalytic activity

Active Publication Date: 2021-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these reports, due to electrochemical oxidation of metals such as Ni, Fe, and Cu under the high oxidation potential of water electrolysis, the composition of the alloy on the surface of the catalyst changes; in addition, the high activity of atomic oxygen, an intermediate product of the OER reaction, is also Facilitates the rapid oxidation of these metals, resulting in a gradual decay of the catalytic activity of the catalyst over longer periods of operation

Method used

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  • Bifunctional electrode for alkaline water electrolysis, and preparation method and application thereof
  • Bifunctional electrode for alkaline water electrolysis, and preparation method and application thereof
  • Bifunctional electrode for alkaline water electrolysis, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0042] 1. Electrode material pretreatment: Cu content ≥ 99.9%, porosity 90%, thickness 1mm, geometric area 6cm 2 Two pieces of foamed copper are used as the base material. First, soak them in acetone at room temperature for 15 minutes to remove the surface grease; finally, soak them in concentrated hydrochloric acid for 15 minutes to remove the surface scale, and then rinse them with a large amount of deionized water. To neutral, dry with high-purity Ar gas;

[0043] 2. Electroplating solution preparation: to analyze pure grade CoSO 4 ·7H 2 O and CuSO 4 ·5H 2 O as Co salt and Cu salt, H 3 BO 3 As a pH stabilizer, sodium citrate as a complexing agent, PEG with a relative molecular weight of 6000 as an additive, and 200ml of electroplating solution prepared with ultra-pure water with a resistivity of 18.2MΩ to control the CoSO 4 ·7H 2 O, CuSO 4 ·5H 2 O, H 3 BO 3 The concentrations of , sodium citrate and PEG are 0.03M, 0.03M, 0.3M, 0.06M and 100ppm respectively. After...

Embodiment 2

[0051] 1. Electrode material pretreatment: The porosity produced by Toray Corporation of Japan is 90%, the thickness is 0.2mm, and the geometric area is 6cm 2 Two pieces of TGP-060 carbon paper are used as the base material. First, soak the two pieces in acetone at room temperature for 15 minutes to remove surface grease, then wash them with a large amount of deionized water until neutral, and dry them with high-purity Ar gas;

[0052] 2. Electroplating solution preparation: to analyze pure grade CoSO 4 ·7H 2 O and NiSO 4 ·6H 2 O is used as Co salt and Ni salt, ammonium sulfate is used as pH stabilizer, EDTA disodium salt is used as complexing agent, PVP K-30 with a relative molecular weight of 55,000 is used as an additive, and 200ml of electroplating is prepared with ultrapure water with a resistivity of 18.2MΩ solution, to control the CoSO in the bath 4 ·7H 2 O, NiSO 4 ·6H 2 O, (NH 4 ) 2 SO 4 , EDTA disodium salt and PVP concentrations are 0.083M, 0.017M, 1M, 0.4M...

Embodiment 3

[0060] 1. Electrode material pretreatment: Ni content ≥ 99.7%, porosity 70%, thickness 3mm, geometric area 6cm 2 Two pieces of nickel foam are used as the base material. First, soak them in acetone at room temperature for 15 minutes to remove surface grease; finally, immerse them in 1M hydrochloric acid for 15 minutes to remove surface scale, and then rinse with a large amount of deionized water. To neutral, dry with high-purity Ar gas;

[0061] 2. Preparation of electroplating solution: to analyze pure NiCl 2 ·6H 2 O and FeCl 2 4H 2 O as Ni salt and Fe salt, H 3 BO 3 As a pH stabilizer, citric acid as a complexing agent, PEG with a relative molecular weight of 8000 as an additive, and 200ml of electroplating solution prepared with ultra-pure water with a resistivity of 18.2MΩ to control the NiSO 2 ·6H 2 O, FeCl 2 4H 2 O, H 3 BO 3 The concentrations of citric acid, PEG and PEG were 2.5mM, 7.5mM, 0.02M, 0.2M and 60ppm respectively. After the components were completel...

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Abstract

The invention provides a bifunctional electrode for an alkaline water electrolysis total battery, and a preparation method and application thereof. The electrode not only can catalyze a cathode hydrogen evolution reaction of alkaline water electrolysis, but also can catalyze an oxygen evolution reaction of an anode of alkaline water electrolysis. In the difunctional electrode, two elements S and O exist at the same time, sulfide can promote rapid occurrence of HER, and oxide can promote occurrence of OER. According to the bifunctional electrode, the fiber surface of a porous conductive material is uniformly coated with a catalyst to form a three-dimensional electrode, so that the reaction area in the thickness direction of the electrode is expanded, electron transfer and substance transmission can be promoted, more reaction active sites can be provided for water electrolysis reaction, the initial potential of OER is reduced, and, the speed of water electrolysis reaction is also increased.

Description

technical field [0001] The invention belongs to the technical field of alkaline water electrolysis, and in particular relates to an electrode for alkaline water electrolysis, a preparation method and application thereof. Background technique [0002] h 2 It is a chemical energy carrier fuel with high energy density, which has the outstanding advantages of being renewable and zero-emission. It can be used as fuel or raw material in many fields, including transportation (such as hydrogen fuel cell vehicles), methanol and steel production, etc. . Among various hydrogen production methods, hydrogen production by electrochemical water splitting (electrolysis of water) is a simple and effective method that can achieve sustainable large-scale production. 2 Primarily used in markets requiring high-purity hydrogen (e.g., electronics and polysilicon). [0003] As the cost of generating electricity from renewable sources, especially solar photovoltaics and wind, falls, there is grow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25D3/56C25B11/075C25B11/031
CPCC25B1/04C25D3/56Y02P20/133
Inventor 邱艳玲李先锋郑琼张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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